Microscopic Electrical Conductivity of Nanodiamonds after Thermal and Plasma Treatments

MRS Advances ◽  
2016 ◽  
Vol 1 (16) ◽  
pp. 1105-1111 ◽  
Author(s):  
Jan Čermák ◽  
Halyna Kozak ◽  
Štěpán Stehlík ◽  
Vladimír Švrček ◽  
Vincent Pichot ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Atomic Force Microscopy ◽  
Electric Current ◽  
Amorphous Carbon ◽  
Rf Plasma ◽  
Electrically Conductive ◽  
Force Microscopy ◽  
Atomic Force ◽  
Plasma Treatments ◽  
Hydrogenated Amorphous

ABSTRACTAtomic force microscopy (AFM) is used to measure local electrical conductivity of HPHT nanodiamonds (NDs) dispersed on Au substrate in the as-received state and after thermal or plasma treatments. Oxygen-treated NDs are highly electrically resistive, whereas on hydrogen-treated NDs electric current around -200 pA at -2 V is detected. The as-received NDs as well as NDs after an underwater radio-frequency (RF) plasma or laser irradiation (LI) treatments contain both electrically conductive (two types: highly and weakly conductive) and highly resistive particles. The higher conductivity is attributed to H-terminated (RF) or graphitized (LI) NDs. The lower conductivity is attributed to NDs with hydrogenated amorphous carbon shell.

Annealing effects on the electrical conductivity of polymerized liquid crystalline 3,4-ethylenedioxythiophene derivatives

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Noelle Wrubbel ◽  
Helmut Ritter ◽  
Knud Reuter ◽  
Alexander Karbach ◽  
Doris Drechsler
Keyword(s):  
Electrical Conductivity ◽  
Atomic Force Microscopy ◽  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Electrically Conductive ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Annealing Effects

Abstract3,4-Ethylenedioxythiophene derivatives with aromatic, in most cases mesogenic, side groups were synthesized and their liquid crystal behaviour was characterized. These monomers were polymerized oxidatively to charged, electrically conductive polythiophenes. X-ray and atomic force microscopy studies were performed. Films of theses polythiophenes achieved via in situ polymerization were prone to a significant increase of the conductivity by annealing.

Atomic Force Microscopy Investigation of Protein Adsorption on Hydrogenated Amorphous Carbon

2013 ◽  
Vol 1527 ◽  
Author(s):  
Muhammad Zeeshan Mughal ◽  
Patrick Lemoine ◽  
Gennady Lubarsky
Keyword(s):  
Atomic Force Microscopy ◽  
Protein Adsorption ◽  
Amorphous Carbon ◽  
Phosphate Buffer ◽  
Adsorbed Layer ◽  
Force Curve ◽  
Hydrogenated Amorphous Carbon ◽  
Force Microscopy ◽  
Atomic Force ◽  
Hydrogenated Amorphous

ABSTRACTProtein adsorption is the first phenomenon which occurs at nanoscale level when a given surface came into contact with a living fluid cell such as blood. Investigation of this adsorption at nanoscale provides useful information about kinetics and mechanism of conformation of proteins on a given surface. The present study investigates the adsorption of proteins using tapping/intermittent mode atomic force microscopy (T-AFM). The approach taken here is that hydrogenated amorphous carbon coating (a-C:H) is used as a model surface because it is amorphous, smooth, inert and hydrophobic. Two proteins namely albumin and fibrinogen in phosphate buffer (PBS) and de-ionized water are drop casted to study the adsorption kinetics. First and second resonance AFM data was used to investigate the adsorbed layer of proteins. AFM force curve and scratch experiment were used to verify the adhesion and thickness of the adsorbed layer. Combination of height, phase images along with the AFM force curve and scratch experiment shows inhomogeneous distribution of albumin protein in phosphate buffer compared to other protein solutions.

scholarly journals Insights into dynamic sliding contacts from conductive atomic force microscopy

2020 ◽  
Vol 2 (9) ◽  
pp. 4117-4124
Author(s):  
Nicholas Chan ◽  
Mohammad R. Vazirisereshk ◽  
Ashlie Martini ◽  
Philip Egberts
Keyword(s):  
Electrical Conductivity ◽  
Atomic Force Microscopy ◽  
Sliding Contact ◽  
Current Transport ◽  
Conductive Atomic Force Microscopy ◽  
Sliding Contacts ◽  
Force Microscopy ◽  
Single Asperity ◽  
Atomic Force ◽  
Sliding Dynamics

Measuring the electrical conductivity serves as a proxy for characterizing the nanoscale contact. In this work, the correlation between sliding dynamics and current transport at single asperity sliding contact is investigated.

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